How to do modalpopupextender from code behind ASP.NET VB

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Hi I am trying to load modal pop up extender from code behind VB. I have tried using Javascript but not sure if my syntax is correct. I tried using javascript to call launchModal() function in front but it doesn't seem to be calling the function. Ideally, The function will search for the modal ID = mp1 and load it. But it doesn't work. Please help, thank you.

<pre><div class="box-footer">
                        <asp:Button ID="btnSave" runat="server" Text="Save" onclick="btnSave_Click" class="btn btn-default" Width="100px" />
                        <asp:Button ID="Client" runat="server" Text="Client Side" class="btn btn-default" />
                    </div>
                    <!-- /.box-footer -->
                </div>
            </div>
            <!-- /.box -->
            <!-- general form elements disabled -->
        </div>
    </div>
    <!-- ModalPopupExtender -->
    <cc1:ModalPopupExtender ID="mp1" runat="server" PopupControlID="Panel1" TargetControlID="Client"
        CancelControlID="btnClose" BackgroundCssClass="modal-background">
    </cc1:ModalPopupExtender>
    <asp:Panel ID="Panel1" runat="server" CssClass="modal-popup" align="center" Style="display: none">
        <br />
        <br />
        Group Code cannot be empty<br />
        <asp:Button ID="btnClose" runat="server" Text="Close" />
    </asp:Panel>
    <!-- ModalPopupExtender -->
    <script type="text/javascript">
        function launchModal(){
            var id = $find("mp1");
            if (id)
                id.show();
            else
                alert("Not found");
        }

        //var launch = false;
        //function launchModal() {
        //    launch = true;
        //}
        //function pageLoad() {
        //    if (launch) {
        //        $find("mp1").show();
        //    }
        //}
    </script>
</asp:Content>

My Code Behind

Protected Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
        If txtGrpCode.Text = "" Then
            Page.ClientScript.RegisterStartupScript(Me.GetType(), "window-script", "launchModal()", True)
            Response.Redirect("frmFm01det.aspx")
        End If

What I have tried:

I have tried using javascript(not sure if my syntax is correct) to call the function infront but it doesn't work at all. I don't even know how to debug.

Posted 4-Jul-17 0:13am

Member 13284181

Updated 4-Jul-17 2:48am

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Richard Deeming · Answer 1 · 2017-07-04T02:48:00

Quote:

Page.ClientScript.RegisterStartupScript(...)
Response.Redirect("frmFm01det.aspx")

RegisterStartupScript tells the page to output the specified script block when the page is rendered.

Response.Redirect then tells the page to throw everything away, and send an empty response telling the browser to load a different page.

If you want the script to run, you need to remove the redirection.